By observing the microstructure of carbon fiber materials, scientists found that the current situation is similar to artificial graphite, which is a turbostratic graphite structure. The spacing between the layers of carbon fiber is about 3.39~3.42a. The arrangement of carbon atoms between the parallel layers is not as regular as that of graphite, and the layers are connected together by van der Waals force.
This structure can be seen as a two-dimensional ordered crystallization and void composition. The content, size and distribution of the voids have a great influence on the performance of the carbon fiber itself. This is why the performance of the same carbon fiber also varies greatly between different grades. difference.
In carbon fiber composite materials formed by the fusion of carbon fiber and resin matrix, the proportion and distribution of carbon fiber fibrils also have a great impact on the overall performance. The porosity can be used to judge whether the structure of the carbon fiber composite material is stable.
Research shows that when the porosity is lower than a certain critical value, the porosity has little effect on the interlaminar shear strength, flexural strength and tensile strength of carbon fiber composite materials. This critical value ranges from 1% to 4%. Similarly, in the case of epoxy resin carbon fiber composite materials, when the porosity exceeds 0.9%, the overall performance has begun to decline significantly.
Carbon fiber tubes are commonly used products made of carbon fiber composite materials. The strength performance depends on the stable physical structure of the carbon fiber and the degree of fusion between the carbon fiber and the resin matrix (that is, the porosity is lower than the critical value). In addition, the preparation of carbon fiber tubes Technology and experience also affect the final performance.
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